XPK Start: Mon Apr 20 13:58:28 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-20 13:58:52.280156: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0420 13:58:52.459133 139968272987968 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 13:59:01.502330 139968272987968 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 13:59:01.504720 139968272987968 distributed.py:172] Connecting to JAX distributed service on mt-04-int8-ress7-slice-job-0-0.mt-04-int8-ress7:8482 I0420 13:59:02.675826 139968272987968 max_utils.py:284] Jax distributed system initialized! I0420 13:59:07.831319 139968272987968 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 13:59:07.831423 139968272987968 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 13:59:07.831463 139968272987968 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365 I0420 13:59:07.831499 139968272987968 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 13:59:08.905763 139968272987968 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 13:59:09.459590 139968272987968 checkpointing.py:688] Setting up checkpoint logger... I0420 13:59:09.459706 139968272987968 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 13:59:09.459751 139968272987968 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 13:59:09.459951 139968272987968 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7f4c4bb18080>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 13:59:12.100290 139968272987968 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 13:59:12.100474 139968272987968 checkpoint_manager.py:708] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b23954e90>}, handler_registry=None I0420 13:59:12.100718 139968272987968 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b23954e90>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0420 13:59:12.100766 139968272987968 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f38a84a7b60>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0420 13:59:12.100801 139968272987968 composite_checkpoint_handler.py:505] Initialized registry DefaultCheckpointHandlerRegistry({('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b23954e90>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b23954e90>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f38a84a7b60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f38a84a7b60>}). I0420 13:59:12.101147 139968272987968 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 13:59:12.101219 139968272987968 async_checkpointer.py:192] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f38a8575440> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 13:59:13.185673 139968272987968 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints I0420 13:59:13.606052 139968272987968 checkpoint_manager.py:929] [process=0][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f4b240660c0> I0420 13:59:13.606245 139968272987968 checkpointing.py:302] Checkpoint manager created! I0420 13:59:14.954123 139968272987968 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 13:59:14.954239 139968272987968 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 13:59:17.215102 139968272987968 maxtext_utils.py:1836] decoder/decoder_norm/scale/value Shape: float32[2048] Physical: (None,) I0420 13:59:17.215216 139968272987968 maxtext_utils.py:1836] decoder/layers/mlp/wi_0/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 13:59:17.215269 139968272987968 maxtext_utils.py:1836] decoder/layers/mlp/wi_1/kernel/value Shape: float32[2048,16,7168] Physical: ('fsdp', None, None) I0420 13:59:17.215312 139968272987968 maxtext_utils.py:1836] decoder/layers/mlp/wo/kernel/value Shape: float32[7168,16,2048] Physical: (None, None, 'fsdp') I0420 13:59:17.215348 139968272987968 maxtext_utils.py:1836] decoder/layers/post_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 13:59:17.215382 139968272987968 maxtext_utils.py:1836] decoder/layers/pre_self_attention_layer_norm/scale/value Shape: float32[2048,16] Physical: (None, None) I0420 13:59:17.215418 139968272987968 maxtext_utils.py:1836] decoder/layers/self_attention/key/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 13:59:17.215453 139968272987968 maxtext_utils.py:1836] decoder/layers/self_attention/out/kernel/value Shape: float32[16,16,128,2048] Physical: (None, None, None, 'fsdp') I0420 13:59:17.215487 139968272987968 maxtext_utils.py:1836] decoder/layers/self_attention/query/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 13:59:17.215519 139968272987968 maxtext_utils.py:1836] decoder/layers/self_attention/value/kernel/value Shape: float32[2048,16,16,128] Physical: ('fsdp', None, None, None) I0420 13:59:17.215550 139968272987968 maxtext_utils.py:1836] decoder/logits_dense/kernel/value Shape: float32[2048,32000] Physical: ('fsdp', None) I0420 13:59:17.215581 139968272987968 maxtext_utils.py:1836] token_embedder/embedding/value Shape: float32[32000,2048] Physical: (None, 'fsdp') I0420 13:59:17.627673 139968272987968 nnx_decoders.py:465] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 13:59:17.627765 139968272987968 nnx_decoders.py:465] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 13:59:17.633134 139968272987968 nnx_decoders.py:465] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 13:59:17.633187 139968272987968 nnx_decoders.py:465] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 13:59:17.649237 139968272987968 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 13:59:17.649299 139968272987968 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 13:59:17.664949 139968272987968 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 13:59:17.665010 139968272987968 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 13:59:17.742235 139968272987968 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 13:59:17.742323 139968272987968 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 13:59:17.757862 139968272987968 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 13:59:17.757919 139968272987968 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 13:59:17.773454 139968272987968 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 13:59:17.773512 139968272987968 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 13:59:17.807674 139968272987968 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 13:59:17.807771 139968272987968 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 13:59:17.886860 139968272987968 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 13:59:17.886946 139968272987968 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 13:59:32.206622 139968272987968 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0420 13:59:32.218703 139968272987968 metric_logger.py:301] number parameters: 1.104 billion I0420 13:59:47.172372 139968272987968 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 13:59:47.410991 139968272987968 checkpointing.py:798] Waited 0.23860478401184082 seconds for step 0 to finish before starting checkpointing. I0420 13:59:47.413491 139968272987968 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 13:59:47.415311 139968272987968 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 0 I0420 13:59:47.417139 139968272987968 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0. I0420 13:59:47.741756 139968272987968 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 13:59:47.768681 139968272987968 jax_array_handlers.py:360] Scheduling D2H of 111 prioritized jax.Array. I0420 13:59:47.768755 139968272987968 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0420 13:59:48.012445 139839253309184 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0 I0420 13:59:48.051198 139968272987968 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.284797s I0420 13:59:48.051974 139968272987968 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 5.097 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3026740550994873 s) (per-host) I0420 13:59:48.052035 139968272987968 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.302753s (batch_requests_ready=0.004885s, total_serialization_initiated=0.297183s, others=0.000685s) I0420 13:59:48.052131 139968272987968 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.306736s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.306718) I0420 13:59:48.052930 139968272987968 event_tracking.py:125] [process=0] [async] Finished blocking save in 0.64 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0. I0420 13:59:48.053293 139839782172416 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 14:19:48.053251 I0420 13:59:48.055221 139968272987968 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 13:59:48.055467 139836564420352 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 13:59:48.055623 139968272987968 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776693587.4134722, 'wait_for_prev_duration_secs': 5.91278076171875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776693587.4153495, 'checkpointer_blocking_duration_secs': 0.6380941867828369, 'get_old_steps_start_time': 1776693588.0534687, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776693587.4116654, 'checkpoint_manager_blocking_duration_secs': 0.6439177989959717} I0420 13:59:48.055752 139968272987968 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 13:59:48.055831 139968272987968 max_utils.py:750] Memstats: After params initialized: I0420 13:59:48.055878 139968272987968 max_utils.py:756] Using (GB) 0.44 / 31.25 (1.408000%) on TPU_0(process=0,(0,0,0,0)) I0420 13:59:48.055911 139968272987968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0)) I0420 13:59:48.055938 139968272987968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0)) I0420 13:59:48.055962 139968272987968 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0)) I0420 13:59:48.403308 139968272987968 metric_logger.py:196] completed step: 0, seconds: 14.634, TFLOP/s/device: 0.928, Tokens/s/device: 139.945, total_weights: 65536, loss: 10.872, lm_loss: 10.872, perplexity: 52668.902 I0420 13:59:48.406204 139968272987968 metric_logger.py:281] To see full metrics 'tensorboard --logdir=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/tensorboard/' I0420 13:59:48.840027 139968272987968 metric_logger.py:196] completed step: 1, seconds: 1.225, TFLOP/s/device: 11.090, Tokens/s/device: 1671.564, total_weights: 65536, loss: 10.872, lm_loss: 10.872, perplexity: 52668.902 I0420 13:59:49.060075 139968272987968 metric_logger.py:196] completed step: 2, seconds: 0.438, TFLOP/s/device: 31.015, Tokens/s/device: 4674.967, total_weights: 65536, loss: 10.260, lm_loss: 10.260, perplexity: 28557.658 I0420 13:59:49.289466 139968272987968 metric_logger.py:196] completed step: 3, seconds: 0.015, TFLOP/s/device: 877.381, Tokens/s/device: 132248.483, total_weights: 65536, loss: 9.728, lm_loss: 9.728, perplexity: 16789.145 I0420 13:59:50.023725 139838738945792 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/items I0420 13:59:50.173301 139836177573632 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776693589735134176, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776693589735134176, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 13:59:51.177781 2864 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 13:59:52.969312 139837126469376 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 111 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/items/array_metadatas/process_0 I0420 14:00:17.539957 139968272987968 metric_logger.py:196] completed step: 4, seconds: 0.221, TFLOP/s/device: 61.467, Tokens/s/device: 9264.998, total_weights: 65536, loss: 9.271, lm_loss: 9.271, perplexity: 10625.563 I0420 14:00:17.598642 139968272987968 metric_logger.py:196] completed step: 5, seconds: 0.228, TFLOP/s/device: 59.463, Tokens/s/device: 8962.840, total_weights: 65536, loss: 8.885, lm_loss: 8.885, perplexity: 7225.917 I0420 14:00:17.777993 139968272987968 metric_logger.py:196] completed step: 6, seconds: 28.251, TFLOP/s/device: 0.481, Tokens/s/device: 72.494, total_weights: 65536, loss: 8.586, lm_loss: 8.586, perplexity: 5354.806 I0420 14:00:18.007387 139968272987968 metric_logger.py:196] completed step: 7, seconds: 0.056, TFLOP/s/device: 242.480, Tokens/s/device: 36549.238, total_weights: 65536, loss: 8.378, lm_loss: 8.378, perplexity: 4350.756 I0420 14:00:18.236582 139968272987968 metric_logger.py:196] completed step: 8, seconds: 0.180, TFLOP/s/device: 75.500, Tokens/s/device: 11380.180, total_weights: 65536, loss: 8.249, lm_loss: 8.249, perplexity: 3824.619 I0420 14:00:18.467409 139968272987968 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 14:00:18.468452 139968272987968 checkpointing.py:798] Waited 0.0010533332824707031 seconds for step 9 to finish before starting checkpointing. I0420 14:00:18.470530 139968272987968 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 14:00:25.124976 139836572813056 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 33.944878s (commit=32.600693s, array_metadata_write=1.344184s) I0420 14:00:25.126130 139839782172416 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 42.262 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.376782178878784 s) (per-host) I0420 14:00:25.126259 139839782172416 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.072850s. I0420 14:00:25.875101 139839782172416 checkpoint.py:228] Read Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776693589735134176, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} from gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 14:00:27.142881 139836177573632 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776693589735134176, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/_CHECKPOINT_METADATA I0420 14:00:27.518738 139839782172416 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000474s. I0420 14:00:27.714663 139839782172416 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0420 14:00:28.687218 139839782172416 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.257567s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/items I0420 14:00:28.689201 139839782172416 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0/items I0420 14:00:29.212616 139839782172416 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0 I0420 14:00:30.665868 139839782172416 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0`. I0420 14:00:30.666718 139839782172416 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 43.25 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/0 I0420 14:00:30.668199 139839782172416 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 42.614788s. I0420 14:00:30.668393 139836564420352 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 14:00:30.668511 139836564420352 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 14:00:30.668576 139836564420352 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 14:00:30.671272 139836564420352 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 14:00:30.671392 139968272987968 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0420 14:00:30.671463 139968272987968 checkpoint_manager.py:1452] Waiting for previous save to complete took 12.200985 seconds. If this number is high, consider checkpointing less frequently. I0420 14:00:30.673401 139968272987968 checkpoint_manager.py:1512] [process=0] Saving checkpoint at step 9 I0420 14:00:30.675488 139968272987968 event_tracking.py:70] [process=0] [async] Started save checkpoint @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9. I0420 14:00:31.394384 139968272987968 jax_array_handlers.py:360] Scheduling D2H of 111 prioritized jax.Array. I0420 14:00:31.394484 139968272987968 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0420 14:00:31.422188 139968272987968 base_pytree_checkpoint_handler.py:154] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.030125s I0420 14:00:31.423029 139968272987968 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/blocking_gbytes_per_sec: 34.502 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04470944404602051 s) (per-host) I0420 14:00:31.423112 139968272987968 base_pytree_checkpoint_handler.py:768] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.044810s (batch_requests_ready=0.004367s, total_serialization_initiated=0.039669s, others=0.000774s) I0420 14:00:31.423200 139968272987968 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.048803s (all_items=0.000016s, per_item={'items': '0.00001645'}, temp_paths=0.048787) I0420 14:00:31.423909 139968272987968 event_tracking.py:125] [process=0] [async] Finished blocking save in 0.75 seconds. Continuing save @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9. I0420 14:00:31.424225 139836564420352 async_checkpointer.py:76] [process=0][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 14:20:31.424192 I0420 14:00:31.625218 139839782172416 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9 I0420 14:00:31.881501 139968272987968 checkpoint_manager.py:1560] [process=0][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 14:00:31.881870 139838179219200 async_checkpointer.py:280] [process=0][thread=save_finalize] Waiting for background save thread=async_save. I0420 14:00:31.882050 139968272987968 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776693618.4704497, 'wait_for_prev_duration_secs': 12.200985193252563, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776693630.6734397, 'checkpointer_blocking_duration_secs': 0.7508847713470459, 'get_old_steps_start_time': 1776693631.4243512, 'get_old_steps_duration_secs': 2.8848648071289062e-05, 'checkpoint_manager_blocking_start_time': 1776693618.4687316, 'checkpoint_manager_blocking_duration_secs': 13.413280248641968} I0420 14:00:31.882233 139968272987968 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 14:00:31.882283 139968272987968 checkpoint_manager.py:2020] [process=0][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 14:00:33.409047 139814087145216 atomicity.py:140] Creating tmp directory gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9/items I0420 14:00:36.570443 139838214985472 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 111 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9/items/array_metadatas/process_0 I0420 14:01:16.658710 139838187611904 base_pytree_checkpoint_handler.py:1282] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.917760s (commit=40.638795s, array_metadata_write=1.278964s) I0420 14:01:16.660025 139836564420352 base_pytree_checkpoint_handler.py:130] [process=0] /jax/orbax/write/gbytes_per_sec: 34.884 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 45.28167200088501 s) (per-host) I0420 14:01:16.660172 139836564420352 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 45.235313s. I0420 14:01:18.287326 139836564420352 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000759s. I0420 14:01:18.406408 139836564420352 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389). I0420 14:01:19.493325 139836564420352 base_pytree_checkpoint_handler.py:1406] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.931233s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9/items I0420 14:01:19.495135 139836564420352 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9/items I0420 14:01:20.056364 139836564420352 atomicity.py:666] Finalizing gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9 I0420 14:01:21.623346 139836564420352 atomicity.py:847] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9`. I0420 14:01:21.624182 139836564420352 event_tracking.py:138] [process=0] [async] Finished save (blocking + background) in 50.95 seconds @ gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/nnx_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_04_int8/checkpoints/9 I0420 14:01:21.625599 139836564420352 async_checkpointer.py:160] [process=0][thread=async_save] Background save thread done. Time taken: 50.200739s. I0420 14:01:21.625834 139838179219200 async_checkpointer.py:288] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 14:01:21.625952 139838179219200 async_checkpointer.py:298] [process=0][thread=save_finalize] No errors found in background save thread=async_save. I0420 14:01:21.626017 139838179219200 checkpoint_manager.py:2137] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 14:01:21.627696 139838179219200 checkpoint_manager.py:2146] [process=0][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 14:01:21.627868 139968272987968 checkpoint_manager.py:2032] [process=0][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0420 14:01:21.628048 139968272987968 checkpoint_manager.py:2009] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 14:01:21.629164 139968272987968 metric_logger.py:196] completed step: 9, seconds: 0.229, TFLOP/s/device: 59.204, Tokens/s/device: 8923.942, total_weights: 65536, loss: 8.174, lm_loss: 8.174, perplexity: 3546.104 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Mon Apr 20 14:01:33 UTC 2026 EXIT_CODE=0